Question

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Answer 1

We already Know that Curved Surface Area of frustum shaped cup is:

$\pi \: l(r1 + r2) + area \: of \: upper \: base$

$\pi \: l(r1 + r2) + \pi \: {r2}^{2}$

$\frac{22}{7} \times 15(10 + 4) + \frac{22}{7} \times {4}^{2}$

$\frac{22}{7} \times 15 \times 14 \times + \frac{22}{7} \times 16$

$22 + \times 30 + \frac{352}{7}$

$660 + \frac{352}{7} = \frac{4620 + 352}{7}$

$\frac{4972}{7} = 710 \times \frac{2}{7}$

$\huge\red{\ddot\smile}$ hope it helps you ✔️ ✅$\huge\red{\ddot\smile}$

Answer 2

Answer:

Radius(r) of upper circular end= 4cm

Radius (R) of Lower circular end= 10 cm

slant height (l) of frustum = 15 cm

area of material used for making the fez=curved surface area of frustum+area of upper circular end

= π(R+r)l+πr^2

= π (10 +4 ) × 15+π × 4^2

= 210π +16 π= 226 × 22/7

710 2/7 cm^2

Step-by-step explanation:

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